Across
- 2. Name of the symbol φ.
- 3. A matrix is not invertible if it's determinant is _______.
- 4. Name of mathematician who gave the mathematical constant "e".
- 6. Collection of objects when not considered in order.
- 7. If a + bi = z, then a - bi is called as complex _______.
Down
- 1. For which geometric figure, equation x² + y² + z² = 1 holds?
- 5. Unit for measuring angles of a circle.